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Power Assisted Steering System With Rack And Pinion Particularly Of The Type With Central Output - Patent 4646868

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The presesnt invention concerns power assisted steering system for vehicles, particularly of the type with central output, incorporating a body forming a housing for a cooperating pinion and rack assembly, atleast one cylinder extending the body in a direction parallel to the rack, at least a first piston means situated in the cylinder and joined to the rack by a rod, and means for selectively admitting a fluid under pressure into the cylinder, at least onthe side of the piston means opposite the rod.Power assisted steering systems with rack and pinion generally incorporate a double-acting piston means associated with the rack and sliding in a single cylinder situated on one side of this rack. Most frequently, the actuating rods of thesteering rods system are joined, respectively, to the end of the rack opposite the piston means, and to one end of the rod of the piston means projecting beyond the latter and passing through the front wall of the cylinder opposite the rack. Powerassisted steering devices of the said type with central output are also known, and to which the present invention particularly refers, in which the actuating rods are joined to the piston rod/rack assembly in an intermediate zone of this assembly, eitherin the region of the rod, as in the document FR-A-1,108,056, or in the region of the piston itself (lengthened), as in the document U.S. Pat. No. 3,312,148. However, as it appears from the two documents in question, the piston means of the slidingtype require, firstly, very accurate machining of the cylinder bore and also, an equally accurate alignment of the axes of the rack, of the piston rod and of the cylinder, which contributes to increase greatly the production costs of such devices.The aim of the present invention is to propose a power assisted steering arrangement of the type mentioned above of simplified and lightened construction, permitting considerably reduced manufacturing costs while ensuring reliable operation, andoffering g

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